If you have time, READ THIS WHOLE REVIEW, otherwise, READ THE BOOK!!!
I was a Harry Potter Kid for so long that I rarely read other book series. So finally, after 4 solid years, I wanted to start another good Adv/Fan series so I started reading Percy Jackson 6 months ago and SiRiUsLy enjoyed it.
Read the first 5 PJO books, loved the humour, characters, the new magical universe and mainly PERCY! A solid 9/10.
I know, I know, we have a LOT of RiordanVerse Books, but what I did right after TLO, was pick CotG up.
It had minor spoilers (1 important one, but if you're casual with spoilers like me, then you wouldn't mind it.) but it is a totally a different book. It's beautifully written, really funny(the humour is close the TLThief, but feels very conversational) and has important themes. Overall it is a really HAPPY book. I rate it a 9.4/10
Potterheads reading this, you're in for a really good treat.
So, if you're reading this right after PJO 5, NO PROBLEM. After all, there are many ways to read the books in this Universe.